Check the appropriate box below if the Form 8-K is intended to simultaneously satisfy the
filing obligation of the registrant under any of the following provisions ( see General
Instruction A.2. below):

o

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

On January 20, 2011, Michael L. Marcum resigned as Senior Vice President, Color & Specialty
Compounds of Spartech Corporation (the Company). Ms. Victoria M. Holt, President and Chief
Executive Officer, will assume Mr. Marcums responsibilities on an interim basis until the Company
fills such position. Mr. Marcums resignation will be treated as a termination without Cause as
defined in his Severance and Noncompetition Agreement (the Agreement). Under his Agreement, in
the event of termination without Cause, Mr. Marcum will receive payments over a 12 month period
equal in total to the sum of (i) 12 months base salary, at the highest rate paid in the preceding
three years (which rate is $290,000 per year), and (ii) his average annual bonus awarded in the
preceding three fiscal years (which average is $55,823). His severance agreement provides for continuing confidentiality obligations and includes
noncompetition and nonsolicitation provisions that are effective for one year following his
resignation.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused
this report to be signed on its behalf by the undersigned hereunto duly authorized.

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